[Delirium-Zer0]

Here's all 11 of them. Just barely enough for a CD actually... spiffy.

YOU "Acoustic Version"
Trust "Acoustic Version"
For My Dear... "Acoustic Version"
SEASONS "Acoustic Orchestra version" (single version)
Dearest "Acoustic Piano Version"
No way to say "Acoustic Version"
Voyage "Acoustic Orchestra Version" (from "No way to say")
Moments "Acoustic Piano Version"
CAROLS "Hammond B-3 Whisper" (i think this counts, personally, since it's done on a real Hammond organ and not a synthesizer, and cuz it's quiet like that)
alterna "Orchestra Version" (from "HEAVEN")
HEAVEN "Piano Version"

The YOU and FMD Acoustics on the singles are different from the AO versions on the ayu-mi-x album.
There's also For My Dear... "Acoustic version -Instrumental" off the FMD Maxi reissue, and I'm not sure which version of SEASONS's AO version is on No way to say, the Single version or the ayu-mi-x III version.